Files in this item



application/pdf9996636.pdf (6MB)Restricted to U of Illinois
(no description provided)PDF


Title:Elastic-Damaging Plasticity Model for Ductile Fracture
Author(s):Ha, Christopher Chul
Doctoral Committee Chair(s):Pecknold, David A.
Department / Program:Civil Engineering
Discipline:Civil Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Metallurgy
Abstract:This study is directed toward the development of a simple material model that can characterize ductile fracture in ferritic steels and that can be used in practical engineering problems. Ductile fracture occurs by a sequential process of nucleation, growth and coalescence of microvoids or microcracks. However, the model uses a continuum approach that can capture the global effect of ductile fracture behavior. It consists of two uncoupled material models; an elastic-damaging model that employs continuum damage mechanics and a von Mises plasticity model. The elastic-damaging model is based on the assumption that damage occurs due only to hydrostatic tension, and this, combined with the von Mises plasticity model, allows a simple formulation of the proposed model. Parameters required by the proposed model are determined by calibrating against experimental data for a specific material. The parameters for the elastic-damaging model depend on the spatial distribution of hydrostatic tension, and are determined by a calibration procedure that utilizes axisymmetric notched specimens. The proposed model is implemented in ABAQUS using a user-defined subroutine, i.e. UMAT. Applications to four-point plane strain bending specimens with a key hole notch and to double-tee circular hollow section tubular joints are presented. The proposed model appears to be capable of simulating, with reasonable accuracy, the failure of metal structures due to ductile fracture.
Issue Date:2001
Description:140 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.
Other Identifier(s):(MiAaPQ)AAI9996636
Date Available in IDEALS:2015-09-25
Date Deposited:2001

This item appears in the following Collection(s)

Item Statistics